The older I get, the less I carry. The last trip saw me taking a Canon G12 for most of my picture taking, and a Nikon Coolpix 9100 for HD video and telephoto work. To this I added extra batteries, memory cards and a small table top tripod. Much easier on the back than a DSLR, flash, 4 lenses, full size tripod, etc.
If I were going to a national park or a once in a lifetime location, I would lug the weight, but for the other 95% of the pictures I take, light is the way to go for me. Although I must say, the new Sony Alpha 7 looks very promising. Small and light.
This with a DSLR.